<template>
  <div>
    <!-- 面包屑视图 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区 -->
      <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['dbbottom', i1=== 0 ? 'bdtop' : '','vcenter']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 渲染一级全选 -->
              <el-col :span="5">
                <el-tag @close='removeRightById(scope.row,item1.id)' closable>{{ item1.authName }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级三级权限 -->
              <el-col :span="19">
                <!-- 通过for 嵌套渲染二级权限 -->
                <el-row :class="[i2===0 ? '':'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag @close='removeRightById(scope.row,item2.id)' closable type="success">{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18" >
                    <!-- 通过for 嵌套渲染二级权限 -->
                    <el-tag @close='removeRightById(scope.row,item3.id)' closable v-for="(item3,i3) in item2.children" :key="item3.id" type="warning">{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>{{ scope.row }}</pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index" label="序号"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit"
              >编辑</el-button
            >
            <el-button size="mini" type="danger" icon="el-icon-delete"
              >删除</el-button
            >
            <el-button @click="showSetRightDialog(scope.row)" size="mini" type="warning" icon="el-icon-setting"
              >分配权限</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 分配权限的对话框 -->
    <el-dialog
      @close="setRightDialogClose"
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%">
      <!-- 树形控件 -->
      <el-tree ref="treeRef" :default-checked-keys='defKeys' default-expand-all node-key='id' show-checkbox :data="rightslist" :props="treeProps" ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 所有角色列表数据
      rolelist: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible:false,
      // 所有权限的数据
      rightslist:[],
      // 树形控件的属性绑定对象
      treeProps:{
        children:'children',
        label:'authName'
      },
      // 默认勾选的id值数组
      defKeys:[],
      // 当前即将分配权限的角色id
      roleId:''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.rolelist = res.data
      // console.log(this.rolelist)
      // this.$message.success('获取角色列表成功')
    },
    async removeRightById(role,rightId){
        // 弹框提示用户是否要删除
        const confirmResult = await this.$confirm('此操作将永久删除该标签, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
        }).catch(err=>err)
        if(confirmResult!=='confirm'){
          return this.$message.info('取消了删除')
        }
      const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if(res.meta.status !== 200){
        return this.$message.error('删除权限失败')
      }
      //  this.getRolesList()//不建议使用，因为每次删除完后会关闭，原因重新渲染
      role.children = res.data
      this.$message.success('删除权限成功')
    },
      // 展示分配权限的对话框
    async showSetRightDialog(role){
      this.roleId = role.id
      //获取所有权限数据
      const {data:res} = await this.$http.get('rights/tree')
      if(res.meta.status !==200){
        return this.$message.error('获取权限数据失败')
      }
      // 把获取到的权限数据保存到 data中
      this.rightslist = res.data

      //递归获取三级节点的id 
      this.getLeafKeys(role,this.defKeys)
      this.setRightDialogVisible = true
    },
      // 通过递归的形式，获取角色下所有三级权限的id,并保存到defkeys数组中
    getLeafKeys(node,arr){
      // 如果当前 node 节点不包含children 属性，则是三级节点
      if(!node.children){
        return arr.push(node.id)
      }
      node.children.forEach(item => {
        this.getLeafKeys(item,arr)
      })
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClose(){
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights(){
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})
      if(res.meta.status !== 200 ){
        return this.$message.error('分配权限失败')
      }
      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  },
  
}
</script>
<style lang="less" scoped>
.el-tag {
  margin: 10px;
}
.bdtop {
  border-top: 1px solid #ccc;
}
.dbbottom {
  border-bottom: 1px solid #ccc;
}
.vcenter{
  display: flex;
  align-items: center;
}
</style>